Aftercare following RF (radiofrequency) treatment

Almost every rule about aftercare turns on one question: “was the skin wounded?” If there is a wound, infection · pigmentation · irritation become issues; if there is not, most of them do not.

Two very different kinds of treatment are currently grouped together under the word “radiofrequency”.

In other words, with microneedling radiofrequency the skin barrier really is open for 3 to 7 days. Precautions for that period have evidence behind them.

With non-invasive radiofrequency, an opening of the barrier has never been measured. Yet the instruction sheet is usually the same. That is where this article starts.

For reference, the safety communication the US FDA issued in October 2025 about burns · scarring · fat loss applies only to microneedling radiofrequency devices. Non-invasive radiofrequency is not covered by it.

Redness, warmth and slight swelling immediately after treatment are normal. How common they are and how long they last has been measured in individual trials.

An honest addition. The systematic review that pooled those 15 studies states that “none of the 15 included studies quantitatively measured or reported patient downtime”. So there is no single correct answer to “how many days until the redness settles”. If we pick the numbers closest to Korean patients, it is generally 1 to 2 days.

This is the most surprising part of this article. We found only two clinical trials that specified post-treatment instructions, and both were close to the opposite of what we commonly advise.

The instructions in the Oligio study of 30 Asian patients (2022) were as follows.

• Return to normal activity immediately
• Apply sunscreen (SPF 30 or higher) daily and avoid direct sunlight
• Avoid anti-inflammatory agents (steroids · NSAIDs) — the stated reason was “to maximise the healing response within the dermis”
• Continue the usual cosmetic routine without restriction

The results were redness in 83.3% lasting 1 to 2 days, facial dryness 3.3%, 0 cases of pigmentation, 0 serious adverse events, and 86.67% improvement at 6 months.

A study of 29 Japanese patients (2026) likewise “instructed patients to continue their usual skincare including moisturiser and sunscreen”, with 0 cases of pigmentation and 0 burns.

So with no restriction on cosmetics and no restriction on activity, complications were zero. The instruction to avoid anti-inflammatory agents is the one unusual item, and even that was a protocol choice in that trial, not a variable that was tested — there is no study comparing a group that used anti-inflammatory agents with a group that did not.

We looked up each of the items below one by one. We could not find a single peer-reviewed study on non-invasive radiofrequency for any of them. Where a source existed at all, it was a clinic blog.

The retinol item is widely misunderstood, so we will address it separately. Some sources cite the fact that a study excluded people who had used retinoids in the 2 months before treatment as grounds for saying “retinol is dangerous”. But that is a design control to keep the study results from being confounded, not a safety finding. The two are entirely different things.

Our position is this. We do not remove every instruction simply because there is no evidence for it. We do not recommend a sauna on the day of treatment — the redness may last longer, and that is a matter of comfort. But we do not tell you it is “dangerous, absolutely forbidden”. We could not find the evidence to say that.

We will look at this item on its own, because here the evidence points in the opposite direction unusually clearly.

Lasers and IPL target melanin and damage the epidermis. Pigmentation comes from that damage. That is why sun avoidance is essential there.

Radiofrequency has nothing to do with melanin. It generates heat from the electrical resistance of tissue, and the epidermis is held at 35 to 45°C by cooling. The mechanism is different.

So we looked at the actual numbers.

To summarise, sun protection is always a good habit regardless of any treatment. We recommend it too. But the claim that “radiofrequency has made your skin vulnerable to UV” has never been measured, and there is in fact a measurement showing pigment decreased. There is no reason to postpone treatment because it is summer.

We could not find any study on ice packs after treatment. But the logic splits both ways on this one, so it is worth writing down.

• For — the warmth and redness settle, which is more comfortable. Since the epidermis is intact there is no risk either.
• Against — the effect of radiofrequency itself comes from the heat shock response. The pigment study in the previous section also points to heat shock proteins as the mechanism. Cooling aggressively right after treatment could, in theory, reduce that response.

The trouble is that nobody has measured this. There is one clue — the devices already cool the surface with gas or refrigerant during treatment and still produce results. In XERF's porcine preclinical work, increases in dermal collagen density and elastin were confirmed while surface temperature was kept below 43°C. That means surface cooling does not abolish the effect in the dermis.

So our advice is this. Cool it if you find it uncomfortable. There is no need to if you do not. We say so while stating openly that there is no evidence either way.

This is the most practical part of the article. Adverse events appear at different times and in different forms.

That 0.36% burn figure is not a current number. It comes from an era of 2002 devices delivering high energy in a single pass. With the current approach of lower energy over multiple passes combined with cooling, the 64-patient study reported 1 blister (and that one from a faulty tip), the 20-patient Korean study reported 0 burns, and the pooled 1,230 patients showed 0 serious or permanent complications.

So there are two times to contact us.
1. Within the first three days — if blisters form, or if the redness has a sharply demarcated border and is painful.
2. Between one and four months — if a groove or hollow that was not there before appears in the treated area. This second window is rarely on the instruction sheet, but the problem deepens if left alone, and there is much more room to reverse it if it is caught early.

We are often asked to “please numb it more heavily”. The evidence here is clear enough that we will state it as it is.

The risk factors identified by the study that analysed cases of fat atrophy were excessive energy, thin areas, and “heavy anaesthesia blocking the patient's pain feedback”. In the 86-patient study, both cases of altered sensation also occurred with nerve block anaesthesia.

The 30-patient Asian study targeted a level of heat sensation scored 3/10, “hot but tolerable”, during treatment.

In radiofrequency, the heat you feel is the dosimeter. If we erase it with anaesthesia, we are treating without a gauge. Telling us “this spot is getting hot” is the single most important safety mechanism during the procedure. Please do not endure it silently — tell us as it happens. For reference, mean pain without anaesthesia was 4.2/10 in a 39-patient multicentre study.

This is the answer to whether you can have another session a few weeks later, and whether you can combine it with other treatments.

• Interval — there is no established evidence. The 39-patient multicentre study used 2 sessions 4 weeks apart, while the 20-patient Korean study and the 30-patient Asian study produced their results with a single session. No study has compared intervals. Four weeks was that trial's choice, not an optimum.
• Radiofrequency + ultrasound — safe on the same day. In a retrospective study of 36 patients in which radiofrequency was performed first and ultrasound afterwards in the same sitting, redness and swelling resolved within 2 days in both groups, with no pigmentation · ulceration · nerve abnormality · fat necrosis. The difference in efficacy was not significant, but satisfaction was significantly higher in the combination group (p=0.0335).
• Areas with filler — the order matters. Radiofrequency operates at 42 to 70°C, and hyaluronic acid degrades with heat. The figures cited in a review article are 36% loss if radiofrequency is done immediately after filler, and 7% loss if more than 14 days have passed. The recommendation is “device treatment first, filler afterwards”. However, these 36%/7% figures are a secondary citation, as we could not access the original paper.

If you are taking isotretinoin (Roaccutane and similar) or have recently stopped it, the conclusion of a 2017 clinical guideline is that radiofrequency does not need to be postponed. That guideline explicitly rejected the long-used six-month waiting rule.

Many people look in the mirror the day after treatment and are disappointed. It is better to know the numbers beforehand.

• In a study of 20 Korean women, there was no statistically significant improvement at 4 weeks. It became significant at 12 weeks and was maintained through 24 weeks. (That said, this study was a single-arm study with no control group.)
• In the same study, instrument-measured elasticity improved significantly from 4 weeks. The physical properties change before anything is visible.
• In the 39-patient multicentre study, the improvement rate rose from 84.6% at 30 days to 92.3% at 90 days.
• Two independent studies report a peak at 4 to 6 months.

So do not judge at 2 weeks. On the evidence, the point at which judgement is reasonable is 3 months, and the peak is later still. We have written about this topic in detail in when results actually start to appear after treatment, and when you should judge them.

1. You may return to normal life immediately. We could not find research supporting activity restrictions, and the clinical trial instruction was to return immediately.
2. Keep using the cosmetics you have been using. We could not find evidence for stopping retinol · acid products. That said, if they sting on the day of treatment, you may take a day or two off.
3. Do use sun protection. It is a good habit regardless of any treatment. There is no evidence that the treatment has made you vulnerable to UV.
4. We suggest avoiding sauna · strenuous exercise · alcohol for roughly the day itself. This is not a safety issue but because redness may last longer. We say this while stating that it is a practice, not evidence.
5. Use ice packs if they are comfortable, and skip them if not. There is no evidence either way.
6. Watch the first three days, and the period from one to four months. Blisters · sharply demarcated painful erythema belong to the earlier window; a hollow or groove that was not there before belongs to the later one.
7. Tell us immediately during treatment if it feels hot. That is the gauge we work by.
8. Do not judge before 3 months. At 4 weeks there was no statistically significant change.

Detailed material on each device is at XERF, Density and Oligio Kiss, and the differences between the three devices are set out in Density · XERF · Oligio: they are all radiofrequency, so what is different?.

We revised our own instruction sheet while writing this article. If items with no evidence are written down as “prohibited”, the two things that actually matter get buried among them. The fewer the rules, the more they are followed.

Written and reviewed by Lee Chi-Hak, MD, medical director of Miso Clinic in Daegu, South Korea. Every study cited above is given together with its design, its size and the limitations the authors themselves recorded, and where we could not find data, we have said that we could not find any.